Chemical Process Cooling
GEPT-R290 CO2 Phase Change Refrigerating Unit
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Oil, Gas & Power Generation
Oil Injection Screw Expander Unit
Pressure-direct-expansion generator converting pressure energy into electricity — 50–1,250 kW, inlet 0.4–5.0 MPa.
Overview
Oil Injection Screw Expander Unit
The oil-injection screw pressure direct expansion generator unit is a kind of expansion power generation equipment which converts pressure energy into electric energy. The expander is in the form of an oil-injection screw: the lubricating oil plays the role of heat attachment, sealing, lubrication and noise reduction. This type of expander has the characteristics of high volumetric efficiency and adiabatic efficiency, and can obtain more net power generation under the same conditions. Materials include gray iron, ductile iron, cast steel and forged steel, selectable according to working conditions and requirements.
Specification
Published parameters
| Inlet temperature range | −40 ~ 200 °C |
|---|---|
| Inlet pressure range | 0.4 MPa ~ 5.0 MPa (max single-machine expansion ratio 20) |
| Flow range | 285 ~ 48,000 Nm³/h (depending on working conditions) |
| Power range | 50 ~ 1,250 kW (depending on working conditions) |
| Expander efficiency | 60% ~ 85% (depending on working conditions) |
| By-product cold energy | Minimum −50 °C, usable standalone or with a compression condensing unit |
| Grid connection | 400 V, 6.3 kV, 10.5 kV synchronous/asynchronous power generation |
| Materials | Gray iron, ductile iron, cast steel, forged steel (per working conditions) |
| Medium | Pipeline natural gas |
|---|---|
| Working condition | 40 / 16 bar(g) |
| Medium flow rate | 3,400 ~ 38,400 Nm³/h |
| Power generation | 50 ~ 646 kW |
Features
What the unit does
- Strong adaptability: stable operation even with inlet pressure and flow fluctuation
- Convenient operation: low working speed, simple maintenance, no special on-duty personnel required
- Compatible with waste heat utilization: low-grade waste heat as low as 35 °C can pre-heat the inlet working fluid
- By-product cold energy at the outlet, comprehensible from process temperature down to −50 °C
- Flexible utilization: grid-connected at 400 V / 6.3 kV / 10.5 kV, or directly drives other equipment
Applications
Where it runs
Mainly used where pressure energy can be recovered: natural gas city station decompression, pipeline natural gas decompression, wellhead natural gas decompression, process gas decompression, process gas flash evaporation decompression, oil and gas wellhead pressure letdown, chemical plant relaxation pressure, and similar services.
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